reducing tee factory

If the method of washing with distilled water is used, the content of chlorides can be reduced. However, this method is difficult to implement and cannot be generalized. Ester is suitable for special needs. In order to protect the valve stem and prevent the corrosion of asbestos packing, the asbestos packing is filled with corrosion inhibitor and sacrificial metal.

The corrosion inhibitor consists of sodium nitrite and sodium chromate, which can form a passivation film on the surface of the valve stem to improve the corrosion resistance of the valve stem; the solvent can make the corrosion inhibitor slowly dissolve, and can play a lubricating effect; in asbestos Zinc powder is added as a sacrificial metal.

In fact, zinc is also a corrosion inhibitor. It can first combine with the chloride in asbestos to greatly reduce the chance of chloride contact with the valve stem metal, thereby achieving the purpose of anti-corrosion. If corrosion inhibitors such as red lead and calcium lead acid are added to the paint, spraying on the surface of the valve can prevent atmospheric corrosion. 5. Electrochemical protection There are two types of electrochemical protection: anode protection and cathodic protection.

The reducing tee factory anode protection is to use the protective metal as the anode to introduce an external direct current to increase the anode potential in the positive direction. When it increases to a certain value, a dense protective film is formed on the surface of the metal anode, which is the passivation film. The corrosion of the metal cathode is drastically reduced. Anodic protection is suitable for metals that are easily passivated. The so-called cathodic protection is to use the protected metal as the cathode, and apply a direct current to reduce its potential in the negative direction. 

Megosztás a facebookon